/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.geode.rest.internal.web.controllers;

import java.util.ArrayList;
import java.util.Set;

import org.apache.geode.cache.Cache;
import org.apache.geode.cache.CacheClosedException;
import org.apache.geode.cache.CacheFactory;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.execute.Function;
import org.apache.geode.cache.execute.FunctionContext;

/**
* The GetRegions class is an gemfire function that gives data about available regions.
* <p/>
* @since GemFire 8.0
*/

public class GetRegions implements Function  {

  public void execute(FunctionContext context) {
    
    ArrayList<String> vals = new ArrayList<String>();
    
    Cache c = null;
    try {
      c = CacheFactory.getAnyInstance();
    } catch (CacheClosedException ex) {
      vals.add("NoCacheResult");
      context.getResultSender().lastResult(vals);
    }

    final Set<Region<?, ?>> regionSet = c.rootRegions();
    for (Region<?, ?> r : regionSet) {
      vals.add(r.getName());
    }
    
    context.getResultSender().lastResult(vals);
  }

  public String getId() {
    return "GetRegions";
  }

  @Override
  public boolean hasResult() {
    return true;
  }

  @Override
  public boolean optimizeForWrite() {
    return false;
  }

  @Override
  public boolean isHA() {
    return false;
  }
};
